Cutting-tool.



PILK INGTON." CUTTING TOOL. M P'ucAnoN hm) JAN. 25. I916.

Pa ented; July 25, 1916,

zllli'fie seq [WWI/5x U ITED STATESPATENT orricn.

JIHOMAS PILI KING'ION, F WILKIINSZBUBG, PENNSYLV KNIA.

CUTTING-TOOL.

bility and wearing qualities of cutting tools,

whichare used. more particularly for outting metals, by providing'i'ncreased strength and improved means for conducting to the. 15, tooli holder or tool body the heat generated at and near thecutting edge, by this means more rapidly reducing the temperature of thecutting edge by dissipatingthe heat in conduction and radiation. to surrounding 2o objects.

In practical work we often find the junc- 1 tion between a tool and its holder defective owin '.todifficulties and uncertainties 'in machming, fitting, welding orbraz'ing, and

as it is highly'desirable that the heat generated at the cutting edge be conducted to the body of the holder, or removed by other means, anyldefect in the continuity of metallic union between tool and holderis un- 3'0 desirablelbecause of the reduced heat-conf ductivity. In order to increase the heat eral courses are available.'

.Thls Invention seeks to increase the com 3 5 ductivity, between tool and bolder by -in-.

' creasing the conducting area of metaljoint or weld; between the two piece's'by welding,

brazing or otherwise attaching metal plates or bpsses to'-the sides of the tool and its 4 4o holder in such a manner as to cover the sides-of the toohifromxitsxcutting edge or edges and extend beyond the tool and cover a portion of the sides-of the-holder. r

Figures 1 and '2 in the drawing show side elevation and plan of a tool and holder with side plates or bosses' already referred to in this specification. These'sid-plates .or bosses are lettered), f, f, f, in the plan view and are indicatedby shadelines' in, the

' side elevation. 'The' cutting edge of the tool is lettered g, in the plan'view. It will'be seen that the bosses orend plates 7, f, f, f,

specification of Letters Patent. Application med January 25, 1916. Serial No. 74,109.

conductivity between tool and holder sevmama July 25, 1916.

. extend a short distance only from the tool and leave the body of the holder comparatively small so that the economy due to a small tool-rest or toolpost is realized;

It is not intended to restrict the position ofthe tool with regard to the holder, as the tool may be attached to the extreme end face of the holder and similar means of reinforcement employed.

Having thus fully described my invention ters Patent 1. A cutting tool consisting of a. holder I claim as new anddesire. to'secure by Letbar of metal, 'a tip of tool steel welded or brazed thereto, and metal reinforcing strips welded, brazed or soldered to the sides of the tip and holder bar so-a-s to increase the vertical cross sectional area of metal'in tip and holder bar at the cutting end of the tool. v 4 v 2. A cutting tool consisting of a bar of metal and a tipof toolsteel welded .or

brazed to the end thereof with metal which also extends to the side or sides of tool steel tip and bar so as to form' a-neinforce;

ment between to'olsteel 'tip and bar;

3. A cutting tool consisting of a bar of metal, together with a tip of hard metal weldedor brazed thereto, and a metal boss 'or bosses welded, brazed or soldered to one or more sides of'the tip and. holder. I 4. A; cutting tool consisting of-a holder of metalwith cutting means of hard metal integrally'united' thereto, and metal reinforcing strips integrally united to the'entire, or the greatei;v part of the side orsides of the cutting means and to'a portion of one orboth sides of the holder.

5; Afcutting. tool consisting of a foursided bar of metal with one end formed to a flat surface which is inclined at any angle. to the longitudinal axis of the metal bar, and a tool steel tip of four sided cross sec-1 tion, welded, brazed or soldered thereto, '00- I V 'gether with one or'more bosses of metal, welded, brazed or solderedto the cutting end of the tool in such a manner asto enlarge the cross sectional area of the cutting end. v f THOMAS PILKINGTON. Witnes'sesz WALTER K; ELDER, OSCAR F. THoMrsoN. 

